<template>
  <view>
    <!-- 购物车区域 -->
    <view class="cart-container" v-if="cart.length !== 0">
      <!-- 地址区域 -->
      <my-address></my-address>
      <!-- 购物车商品列表的标题区域 -->
      <view class="cart-title">
        <!-- 左侧的图标 -->
        <uni-icons type="shop" size="18"></uni-icons>
        <!-- 描述文本 -->
        <text class="cart-title-text">购物车</text>
      </view>

      <!-- 循环渲染商品 -->
      <uni-swipe-action>
        <view v-for="(goods,i) in cart" :key="i">
          <uni-swipe-action-item :right-options="options" @click="swiperActionClickHandler(goods)">
            <my-goods :goods="goods" :showRadio="true" :showNumber="true" @radio-change="radioChangeHandler"
              @num-change="numberChangeHandler">
            </my-goods>
          </uni-swipe-action-item>
        </view>
      </uni-swipe-action>

      <!-- 计算区域 -->
      <my-settle></my-settle>
    </view>

    <!-- 空白购物车区域 -->
    <view class="empty-cart" v-else>
      <image src="../../static/cart_empty@2x.png" class="empty-img"></image>
      <text class="tip-text">空空如也~</text>
    </view>

  </view>
</template>

<script>
  import {
    mapGetters,
    mapState,
    mapMutations
  } from "vuex";
  import badgeMix from '@/mixins/tabbar-badge.js';

  export default {
    mixins: [badgeMix],
    computed: {
      ...mapGetters('m_cart', ['total']),
      ...mapState('m_cart', ['cart']),

    },
    onShow() {
      this.setBadge()
    },
    // 监视total值的变化
    watch: {
      total() {
        this.setBadge()
      }
    },
    methods: {
      ...mapMutations('m_cart', ['updateGoodsState', 'updateGoodsCount', 'removeGoodsById']),

      // 触发勾选事件
      radioChangeHandler(e) {
        this.updateGoodsState(e)
      },
      // 触发数量更新事件
      numberChangeHandler(e) {
        this.updateGoodsCount(e)
      },
      // 绑定滑动删除事件
      swiperActionClickHandler(goods) {
        this.removeGoodsById(goods.goods_id)
      },
      setBadge() {
        uni.setTabBarBadge({
          // index 表示 从左边算起的tabBar的哪一项
          index: 2,
          // text 表示显示的文本
          text: this.total + ''
        })
      }
    },
    data() {
      return {
        options: [{
          text: '删除',
          style: {
            backgroundColor: '#c00000'
          }
        }]
      };
    }
  }
</script>

<style lang="scss">
  .cart-container {
    padding-bottom: 50px;

    .cart-title {
      height: 40px;
      display: flex;
      align-items: center;
      font-size: 14px;
      padding-left: 5px;
      border-bottom: 1px solid #efefef;

      .cart-title-text {
        margin-left: 10px;
      }

    }
  }

  .empty-cart {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 150px;

    .empty-img {
      width: 90px;
      height: 90px;
    }

    .tip-text {
      font-size: 14px;
      color: gray;
      margin-top: 15px;
    }
  }
</style>
